One vertex per element, one color per generator, with an edge from x to x·s.
(3,7)(6,8)(9,10,14,15)(11,13,17,21)(12,16,19,22)(18,20,23,24)(25,26)(27,34)(28,29)(30,37)(31,33)(32,39)(35,36)(38,40)(1,2,4,5)(3,6,7,8)(12,19)(16,22)(18,23)(20,24)(25,27,31,37)(26,30,33,34)(28,35,32,40)(29,38,39,36)(1,2)(3,6)(4,5)(7,8)(10,15)(11,17)(16,22)(18,23)(25,28,31,32)(26,29,33,39)(27,35,37,40)(30,38,34,36)(2,5)(6,8)(9,11)(10,13)(12,18)(14,17)(15,21)(16,20)(19,23)(22,24)(25,29,31,39)(26,32,33,28)(27,36,37,38)(30,35,34,40)(1,2)(3,8)(4,5)(6,7)(9,12)(10,16)(11,18)(13,20)(14,19)(15,22)(17,23)(21,24)(25,26)(27,34)(28,29)(30,37)(31,33)(32,39)(35,36)(38,40) involution — undirected(1,3)(2,6)(4,7)(5,8)(9,13)(10,11)(12,20)(14,21)(15,17)(16,18)(19,24)(22,23)(25,30,31,34)(26,27,33,37)(28,38,32,36)(29,35,39,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.